论文标题
LEO卫星通信与双分辨率相变和非线性功率放大器的大量MIMO混合编码
Massive MIMO Hybrid Precoding for LEO Satellite Communications With Twin-Resolution Phase Shifters and Nonlinear Power Amplifiers
论文作者
论文摘要
大量的多输入多输出（MIMO）传输技术最近在非斜地点（例如低地球轨道（LEO）卫星通信（SATCOM）系统中引起了很多关注，因为它可以显着提高能源效率（EE）和光谱效率。在这项工作中，我们在巨大的MIMO LEO SATCOM Downink中开发了一种混合模拟/数字预码技术，从而降低了车载硬件的复杂性和功耗。在拟议的方案中，模拟预编码器是通过更实用的双分辨率阶段转移（TRP）网络实现的，以在功耗和阵列增益之间进行细致的权衡。此外，我们考虑并研究了非线性功率放大器（NPA）在系统设计中的失真效应的影响。通过共同考虑上述所有因素，我们提出了一种基于NPA的基于TRPS的混合编码问题的有效算法方法。数值结果表明，考虑到拟议的基于TRPS的混合编码方案的非线性失真和性能优越性，EE的收益比基准的增长。
The massive multiple-input multiple-output (MIMO) transmission technology has recently attracted much attention in the non-geostationary, e.g., low earth orbit (LEO) satellite communication (SATCOM) systems since it can significantly improve the energy efficiency (EE) and spectral efficiency. In this work, we develop a hybrid analog/digital precoding technique in the massive MIMO LEO SATCOM downlink, which reduces the onboard hardware complexity and power consumption. In the proposed scheme, the analog precoder is implemented via a more practical twin-resolution phase shifting (TRPS) network to make a meticulous tradeoff between the power consumption and array gain. In addition, we consider and study the impact of the distortion effect of the nonlinear power amplifiers (NPAs) in the system design. By jointly considering all the above factors, we propose an efficient algorithmic approach for the TRPS-based hybrid precoding problem with NPAs. Numerical results show the EE gains considering the nonlinear distortion and the performance superiority of the proposed TRPS-based hybrid precoding scheme over the baselines.
